Computernetze kompakt by Christian Baun

By Christian Baun

Das Werk bietet einen kompakten Überblick über das Thema Computernetzwerke. Sein Aufbau orientiert sich an den Schichten der etablierten Referenzmodelle und behandelt für jede Schicht die Geräte und die wichtigsten Protokolle. Zu den Protokollen gehören auch Netzwerktechnologien wie Ethernet, WLAN, Bluetooth, usw. und die Übertragungsmedien. Ziel des Buches ist keine Auflistung von Algorithmen, sondern eine an der Realität orientierte Beschreibung, die die wichtigsten Technologien in einem klaren Zusammenhang behandelt. Das Buch soll dem Leser ein fundiertes Verständnis von Computernetzwerken in kompakter shape vermitteln. Die dritte Auflage wurde durchgängig aktualisiert und korrigiert. Neu hinzugekommen ist Kapitel eleven, das eine Übersicht über wichtige Kommandozeilenwerkzeuge zur Netzwerkkonfiguration und examine von Netzwerkproblemen enthält.

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Jedes IP-Paket wird unabhängig an sein Ziel vermittelt (geroutet) und der Pfad dabei nicht aufgezeichnet. Andere Internetprotokolle wie IPX wurden von IP weitgehend verdrängt. 4 Transportschicht Die Transportschicht (englisch: Transport Layer) ermöglicht den Transport von Segmenten zwischen Prozessen auf unterschiedlichen Geräten über sog. Ende-zu-Ende-Protokolle. Beim Sender verpackt die Transportschicht die Daten der Anwendungsschicht in Segmente. Beim Empfänger erkennt die Transportschicht die Segmente in den Paketen der Vermittlungsschicht.

4). Die unterschiedlichen WLAN-Standards verwenden unterschiedliche Modulationsverfahren (siehe Tab. 5). 50 5 Bitübertragungsschicht Tab. 11b mit 22 MHz breiten Kanälen und einem Kanalrasterabstand von 5 MHz existieren nur drei (EU und USA) bzw. vier (Japan) Kanäle, deren Signale sich nicht überlappen, nämlich die Kanäle 1, 6 und 11, sowie zusätzlich nur in Japan Kanal 14 (siehe Abb. 1). DSSS ist ein Frequenzspreizverfahren, das die Nutzdaten über einen breiten Frequenzbereich verteilt und darum weitgehend unempfindlich ist gegenüber schmalbandigen Störungen wie zum Beispiel Bluetooth.

1 enthält eine Auswahl bekannter Ethernet-Standards. In Tab. 1 ist auch das einheitliche Namensschema der EthernetStandards erkennbar. Jeder Name besteht aus drei Teilen. Teil 1 definiert die Übertragungsrate, Teil 2 das Übertragungsverfahren (Basisband oder Breitband) und Teil 3 den hundertfachen Faktor der maximalen Segmentlänge oder das Übertragungsmedium. 1 Vernetzungstechnologien 45 Übertragungsrate: 10 Mbit=s Übertragungsverfahren: Basisband Maximale Segmentlänge: 5 100 m D 500 m. 1 Übertragungsverfahren bei Ethernet Mit einer Ausnahme arbeiten alle Ethernet-Standards mit dem Basisband-Übertragungsverfahren (BASE).

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